Of cowstbttctingi- steam-boilers



UNITED srnrus rnrunr uric ZuNAs o. RoBeINs, or sfr. LOUIS, MISSOURI.

MNNER or oonsrauctrrne STEAM-sortierte;

Speccatonof Letters atent o. 3,2WO, dated July 2S, 182134.

To all whom it may concern: n

Be it known that "I, ZENAS C. RoBBINs, of St. Louis, in theState of Missouri, have vented a new and useful Mode of Construct- Boilers for the Generating 'of Steam,

and l do hereby declare that the following is a `full and exact description thereof.

My boiler consists of two principal parts, one of which I denominate the double, concentric boiler, and` V the other the larger boiler, or feeder. These are to be so con- Iiected together as to constitute one coinbined boiler, or stea'm generator. Bothf of these boilers are cylindrical, and are, usually, both placed horizontally, and parallel to each other. The double concentric boiler maybe one half,` or one third, more orless, of the length ofthe large boiler, or feeder; in it is contained the furnace, the heat from which isto generate steam in the concentric boilers by whichthe furnace is surrounded, and likewise in the large boiler, or feeder,

for which latter purpose a flue leading fromthe double concentricboileris carried twice through the largeboiler, whenceit escapes through a chimney in the ordinary way.

In the accompanying'drawing Figure l,

is a plan, or top view, of my combined boil-` ers, A, being the large boiler, or feeder, and B, the double concentric boiler. ln the respective figures, these are designated by the same letters of reference; and the same is the case with the other parts, wherever they are repeated. Fig. 2, is a side view, or elevation, of the two boilers. Fig. 3, is an elevation of the boilers, with some of their appendages. Fig. t, is an end elevation of thed'ouble concentric boiler; the furnace and ash-pit doors being removed. Fig. 5, is an elevation of the rear end of my combined boilers, showing the flue (l, (Z, through which the heated air passes, the chimney f, in which said flue terminates, and the pipes a, u', by which the water chambers of the respective boilers are connected. Fig. 6, is a vertical, cross section through Vthe combined boilers, in the line C, D, of` Figs. l, and 7. Fig. 7, is a horizontal section through the centers of the combined boilers,

in the line F, G, of Fig. 6.

In Figs. o, and 7 z', z', shows the outer, and h, it, the inner, water space of the double concentric boiler, and e, e, the flue space between them; Z, is the grate bars for sustaining the fuel; 0, o, are brackets preserving the concentric boilers in their relative posias shown at t, F ig. '7; and the outermost of these boilers extends to the front plate, or head, g, g, leaving a space between the front end of the inner boiler and the furnace head 1g, for the passage ofthe smoke and heated air in their way Ifrom the chambers of combustion into theflue space, e, c, between the two boilers, whence it passes into the flue cl, d, which is bell-shaped at CZ', CZ,`b`ut assumes the cylindrical form as shown at al, d, and is recur'ved, as represented in the drawings, so as to pass back and forth through the large boiler A, and to the eXit pipe, or chi'mney f. The direction of the `draft from the furnace, and through the flue spacesis indicated `by thearrows'. o, o, o, are screw heads, for the ends of iron rods, which pass ithrfongh the head y, g, and the `edge of the hell-formed part of the flue pipe d', CZ', serv- ;ing to confine them to the ends of the outer idouble` boiler; the ends of this boiler are not" formed by these heads, butare independent of them. The rear end of the furnace is `closed by the plate m, m, there not being any draft through it in this direction. The i outer, concentric boiler into the large boiler.`

In Fig. 8, g, g, are the furnace doors, and r, r, the ash-pit doors, to admit a scraper to clearthe ashes from under the grate bars, `and from between the boilers; p, is a door opening into the flues el, rl, for cleaning them out.

For the purpose of rendering the combustion 'of the fuel in the furnace the more eflicient, l have devised a mode `'of heating theair which is to be admitted into the rear end of the ash-pit. A tube, c, c, a belllshaped opening into which is shown at c',

isinade to pass throughthe flue el, (l, and to enter the rear end `of the ash-pit; in doing which, the air will necessarily acquire a temperature equal to that of the heated portion contained inthe flues.

lt will be` manifest that the above described apparatus may be varied in form,

resented my apparatus under modications which will in some cases be preferred to that above described. The only material change under this arrangement, consists in the placing of the large boiler, or feeder, A, vertically; the double concentric boilers remaining precisely as described above. The same letters of reference which are used in the first sheet of drawings will, therefore, fully designate the nature and use of the respective parts.

In Figs. l, 2, 3, 4 and 5, of drawing No. 2, I have represented another manner of constructing my steam-boiler. Fig. l, is a front elevation of the boiler under this modification, and Fig. 2, a side elevation thereof. Fig. 3, is a vertical section from front to back, through the middle of the apparatus, or in the line A, B, of Fig. 1. Fig. 4, is a vertical, cross section in the line C, D, of Fig. 3. Fig. 5, is a horizontal section through it, in the line E, F, of Fig. 4. Under this modification the outer concentric boiler is omitted, as is also that denominated the large boiler, or feeder, their place being sup" plied by a large, cylindrical boiler I. The furnace is the same as in my first described arrangement, and is situated within the inner annular boiler, it, it; in this furnace and boiler, and their appendages, the parts that are similar to those in the modifications before described are designated by the same letters of reference. I propose under this modification to feed my furnace at the rear end, where it is closed by the partition m, m. J, is a feeder furnished with a valve at K, which may be opened, and the fuel forced into the feeding tube L, by means of a slider, M, extending at its inner end to the height of the valve K. The flues el, d, and the air tubes c, c, are, so far as this arrangement admits, similar to those formerly described.

I intend, sometimes, to employ an improved apparatus for the heating, by means of the waste steam, the water by which the boiler is to be supplied, and also the air for sustaining combustion. Fig. 8, is a vertical section along this apparatus. N, and O, are two cylinders placed one above the other, and having heads at I), P; these heads are inclosed by conical caps Q, Q; from one of the heads to the other extends any desired number of tubes, It, It, opening into the spaces formed by the conical caps. Through the openings S, S, in the conical caps, water is to be introduced so as to pass through the` tubes in the lower cylinder; and air, so as to pass through those in the upper cylinder. rThe waste steam is to be introduced into the lower cylinder through a suitable opening, as at T, and to pass thence through a tube U, into the upper cylinder, in the first of which it will heat the water contained in the tubes, and in the second, the air. V, is a pipe through which any waste water from the condensation of steam may be allowed to escape. The tube W, is intended for the purpose of admitting a portion of steam from the lower cylinder to commingle with the heated air as it passes toward the furnace. X, is a tube, furnished with a valve, for the final escape of steam from the upper cylinder.

Having thus fully described the manner in which I construct my steam boiler, or generator, and explained the action of the respective parts thereof, what I claim therein as new, and desire to secure by Letters Patent, is

l. The manner in which I construct the furnace, and combine it with the annular, cylindrical boiler, L, L, which immediately surrounds it; the peculiarity in said furnace consisting in its being closed at the rear end, the air for supporting combustion being also admitted at that end, and the gaseous products of combustion passing toward the front, and then toward the rear on the outer side of the boiler, h, h; an arrangement existing in each of the modifications of my boiler.

2. I also claim the manner of constructing lthe double concentric boiler, in combination with a furnace closed at its rear end, and otherwise formed as above set forth.

3. I claim the manner of combining the double concentric, and the large boiler, or feeder, by means of the flue CZ, d, constructed, and arranged as described under my first and second modifications thereof, the large boiler in the former case being horizontal, and in the latter, vertical.

4. I claim the manner of combining my furnace with the annular boiler, L, 7L, and with the large cylinder, A, A, as described and represented under my third modification; the large cylindrical boiler being, in this case, substituted for what I have called the large boiler, or feeder.

ZENAS C. ROBBINS.

Vitnesses:

Trios. P. JONES, EDWIN L. BRUNDAGE. 

